Auxiliary air and fuel mixing device



March 30 1926. v J. S. POOLE AUXILIARYIAIR AND FUEL MIXING DEVICE Filed Feb. 9, 1924 I "Invervbove vhto-r-me s Patented Mar. 30, i y p ''UNITED STATES PATENT I OFFICE.

JOHN SEVILLE POOLE, F CAMBRIDGE, MASSACHUSETTS, ASSIGNOR OF FORTY-ININE ONE-HUNDREDTHS T0 HAROLD E.

SETTS. I

AUXILIARY AIR AND FUEL MIXING DEVICE.

Application filed February 9, 1924. Serial No. 691,842.

GARRABRA-NT, OF CAMBRIDGE, .MASSAGHU-- I 35v proportion.

To all whom it may concern:

Be it known that-I, JOHN S. POOLE, a citizen of the ,United States, residing at Cambridge, in the county ofMiddlesex and State of Massachusetts, have invented certain new and useful Improvements in Auxiliary Air and Fuel Mixing Devices; and I dlo hereby declare the following to be a full, 0 ear such as will enable others skilled in the art 7 to which it appertains to make and use the same. j' I This invention relates to internal com bustion enginesand more particularly to an auxiliary carbureting or secondary air and fuel commingling or' mixing device for internal combustion engines.

The principal object of the invention is to provide a device of the character referred to, by which unmixed or imperfect- 'ly mixed portions of combustible fuel drawn from the ordinary carburetor, may be transitorily subjected to a and thorough remixture with fresh, air supplied from.- an auxiliary source, to render the explosivecharge increasingly combustible as it is sucked through the intake manifold into the, respective combustion chambers of an engine.

Another object is to provide a device of the character described which will decrease fuel consumption and increase the operative efficiency of an engine by effecting a thorough mixture of air and fuel in proper A further object is to provide an auxiliary air and fuel mixing device or adjuster which will beautomatic in itsaction. and wholly eliminate loss of fuel resulting from 4 the imperfect charges or whenused alone, and which will substantiah ly reduce or eliminate theobjectionable carbon deposits caused by a burning of un-; 4 miixed fuel unavoidably drawn from the carburetor nto the combustion chambers of the englne along with the explosive charges,

especially from carburetors which have been an internal combustion engine, are further and exact description of the invention, I

further comminglin'g a My improved incomplete mixtures effected by the ordinary carburetor desiderata which have been borne in mind in the production of my improved auxiliary mixing device.

The invention will first be hereinafter more particularly described-with reference to the accompanying drawings which are to .betaken as a part ofthis specification and then pointed out in the claim at the endof the description.

In said drawings; Fig. 1 is a diagrammatic side elevation of the intake manifoldland carburetor of an internal combustion engine, illustrating the application of my improved auxiliary mixing device thereto, the manifold being broken away and shown partly in section. I f' Fig. 2 is a longitudinal sectional eleva-. tion of the auxiliary air introductory and miaring device embodying my invention; an u Fig. 3 isan end section of the same, taken on the line 3- 3 of Fig. 2.

Referring to the drawings in which like reference numerals are used to designate corresponding parts throughout the several views, 4 denotes an ordinary carburetor and 5 the intake manifold of an internal combustion engine.

and fuel remixing device is preferably intr-oduced in the manifold intermediate the cylinder head and the carburetor, or above the conventional butterfly valve 6 which is usually provided either in the carburetor or inthe manifold for a well known purpose.

My improved mixing device is preferably made from solid brass bar stock and comprises a cylindrical body'portion 7 having an axial bore or central annular-opening extending longitudinally. therethrough and formed with a reduced threaded extension 8 on onefiend, while counter-bored at the opposite end to form an annular recess or chamher 9 the. base of which is frusto-conically constricted or tapered to provide a valve seat. The Walls of said recess or chamber are also partially threaded to receive the correspondingly threaded end of a nozzle 10 auxiliary air introductory the dischargeend of the'latter being slightly tapered and ex'teriorly threaded for engagement within a correspondingly threaded {orifice provided in the 'intake manifold, through which the nozzle is adapted pro jectingly to extend, and support the dethereagai'nst.

tive combustion chambers;

intervals around and parallel to the central o'r axial opening therethrough, said passages being shown terminating in the valve seat or frust-o-conical bottom of the recess 9 therein.

A suction plunger or valve 12which is preferably formed with an enlarged head spaced circumferentially a: slight distance from the annular Wall of the recess 9 and adapted normally to press firmly upon the tapering seat formed in the base of the latter, is provided for the purpose of closing the air passages when the engine is idle.

Said plungeror valve is carried by a re ciprocable stem 13, which extends outwardly through the central opening in the body portion of the device, its projecting end being encircled'by an .expansible spring 14.

and provided with an extremital abutting shoulder or keyed washer 13 between which and the extension 8 the spring 14 is 'tensionally confined Said spring is preferably formed of finely tempered steel to permit a-sensitive action of the plunger or valve A cap 15 having an air screen l6 secured in its outer open end, is adapted to threaded engagement over the reduced extension 8 of the main body portion to provide a protective enclosure for the projecting valve-stein and spring, yet permitting free suction of,

fresh air through the device when theengine is in operation. i

For convenience in attachment or removal, the peripheries of the body portion 7 and the cap 15 may be partially knurled as shown. v

The operation of my improved auxiliary air introductory and fuel remixing device is as follows:

When the engine is started, a pulsating suction, is set up in the intake manifold,

as combustible fuel charges are drawn therethrough from the carburetor to the respeccauses the valve .12 to unseat against the tension of spring 14:" and allows air to be valve'and out through the nozzle lO ointo the manifold, where it will be commingled and mixed with the transient combustible gases imperfectly or incompletely mixed and emitted by the carburetor, thus aux-.

iliarly supplying such ,gases'witli the requisite amount of oxygen to effect a complete or refined mixture so that incomplete charges or fuel in liquid state will not be mittent This suction sucked into the combustion chambe rs' with consequent Waste and resulting carbon deposits.

'- Itwill be understood that .whenthe engine is in operation, the force' of suction created in the. intake manifold will cause the valve 12 to open or allow'it partially to close, depending upon the degree of suction maintained in, said manifold under varying speed conditions or the extent of motor acceleration, so that supplementing quantities of air will be admitted or introduced in said manifold'through the device in increased proportion to the increased suction or increased quantities of fuel drawn into the manifold from the carburetor.

By reason of the resistances provided by its peculiar arrangement and construction, the air thus drawn through the device is, broken up or emitted therefrom in inter: ufls rather than in a steady flow, so that the air will more freely commingle and mix-with the explosive vapors within the manifold.

The simplicity, value and advantages of my improved auxiliarly air introductory and fuel remixing devicewill be obvious from the foregoing description and it is thought that further explanation 'or dis- 'cussion of its merits are unnecessary.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of. the United States, is.

v In combination with the fuel inlet mani-I fold of an internal-combustion engine, an

auxiliarly air introductory device, compris-f.

ing a main cylindrical body portion having a central opening, extending longitudifially therethrough and formed, with a reduced extension on one end and a recess in its opposite end providing a valve'chamber; air passages extending through said body central opening the bottom of said recess, said passages communicating directlyebetween said chamber and the atmosphere; a recipr'ocable suctionportion substantially parallel to thetherein and terminating in plunger normally seated within said cham- .berwvith its stem extended through said opening and adapted to open and close said air passages according to the operation of the engine, a nozzle in open communication with said valvechamber secured to and dis-' e. plunger stem, having an a 

